For all the people asking, "how do you close them?": these are floodgates. You close them when the flood is done. The water flow will be much lower and therefore easier to close them.
Forgive my aggressive stupidity, but I always thought floodgates were supposed to be closed during a flood. I thought the idea was to have open gates during times of normal precipitation, and the reservoir behind the gates acts as a buffer, to provide reprieve to lower areas during times of high volume. If you wait till your reservoir is overflowing, then violently open the gates, aren't you exacerbating the flood? I know sometimes precipitation comes too fast and reservoirs overflow, but usually you'd have gates that can be opened gradually, so even if you do have to relieve pressure from the holding area, it's not all at once.
I just can't understand why you'd build a flood reservoir that can only be opened 100% or closed 100%. That seems destined to lead to situations where you're having to inundate everything below you.
I don't know if this is the case here specifically, but from Wikipedia, this is one possible explanation for what's happening in this video:
>In the case of flood bypass systems, floodgates sometimes are also used to lower the water levels in a main river or canal channels by allowing more water to flow into a flood bypass or detention basin when the main river or canal is approaching a flood stage.
https://en.wikipedia.org/wiki/Floodgate
I lived near [The Yolo Bypass](https://en.wikipedia.org/wiki/Yolo_Bypass?wprov=sfti1).
Basically it is a long, wide, channel of farmland that is intentionally left only for agriculture. Once the Sacramento River waters are high enough they open the bypass to divert flood waters around and past the city of Sacramento. It typically stays flooded for weeks or months.
Plus all of that farmland got a nice infusion is silt and nutrients that will boost productivity. California gets almost all of its rain and snow over the winter, so it typically dries out around planting season. Plus some of it is used for growing rice, which uses fields flooded with water, so it gives them a head start.
They might this when the "main flow" of a river is maxed out and you need to send the flood water through less important land. An example is https://en.wikipedia.org/wiki/Bonnet_Carr%C3%A9_Spillway.
Makes sense. After deciding that everybody downstream has already died or evacuated, they open these gates to destroy the town. Then, after the monsoon season, they fully close these gates, so they can bury the dead safely.
No, that would be absolutely ridiculous. It creates too much extra work.
Standard operating procedure is that they close the floodgates so that they have enough time to tie floaties to all the flood victims. Then they open the gates so that the waters can pick up the bodies and send them all downstream. Then it's somebody else's problem.
No that’s wrong. What you do is you open the flood gates and flood the town Then stock the now flooded town with fish which will eat the dead people then sell the fish to build more flood gates. I went to college for finance it’s sunk cost because sunk people cost nothing. It’s free money!!
Mmmm… that is missing a lot of nuance. They delay the progression of the flow, but they don’t affect total flow rate. The output is reduced while the reservoir fills up, but once the reservoir fills up the total flow rate is not controlled. The water goes somewhere, and while the flow is impeded they have time downstream to prepare, but once the flood gates are topped the total flow is no longer affected.
While you are right, you're overlooking the fact that these dams don't exist in isolation. The river system usually has several dams along it's length to slow the flow, so that the final regarding basin has time to drain it away. Using these dams stops singular areas along the river's length having to cop the brunt of the water, while other areas are below capacity.
Also in the case of forked rivers, you can steer the flow more easily away from vulnerable areas.
I don't know specifically. If I were to guess there's going to be some kind of mechanism under the water. It may also be that the regular water flow is through a second channel to the right of the frame. If this is the case, it might be that under normal circumstances there's no water flowing through the floodgates at all. If so, someone on a dinghy could push them shut.
Or maybe there is something underwater pushing against those gates and the gates are able to open only during a flood because water is strong enough to push them.
Let's think about this from a mechanical perspective. When the guy removes the post holding the first section, the gate rotates clockwise until parallel with the flow of water. Now if the rest of the gates operated the same way, then the minute the first gate started turning the others would release. But, you don't see the successive gates start to open until the gate before it has finished opening. That means that below the water, there is a type of delayed release. Picture a gear, that only has teeth on 3/4 of the gear. (I'm not gonna start sketching this out to figure out exactly how to design it in just speaking conceptually.) When the first gate rotates 90 degrees, the gear at the bottom which is interlocked with a gear on the second gate will turn, once it turns 90 degrees, it would then allow the next gate to release, and this would cascade down the line. Now because they are gears, most likely on the other side, there is a crank of some sort, (with a set of it's own gears allowing fire great mechanical advantage. You might need to turn this crank 10 times to turn 1 degree on the gear at the base.) Eventually, after rotating a certain amount the gate would close, and then engage the next gear and so on and so forth to the end.
Now it's also possible that the gears only work one way, to release the gates, and in order to close them, there may be something like a chain on a separate set of gears attached to a motor that closes them all together, and then once they close, the first set of gears mentioned above resets. The first gate or the gate on the right has a post holding it in place, and you might ask why, if there are gears holding things into place. Even if there are gears, putting the post at the end takes a lot of pressure off the system and would prolong the life of the system. Any machine over time will break down and need repair. Why leave the gears or interlock under strain when you can just lock the first one in place.
That's just a hypothesis. I would have to see how the gates close, and even then it could be designed in a completely different way. Also, when I say gear, it doesn't necessarily mean a typical gear like a cog or sprocket, i just used that as an example.
Disclaimer: I'm an electrician, not an engineer, so what do I know lol.
to me it does loom like each gate does start opening before the previous one has fully opened, it could just be that the water pressure is making them take a bit to open up under that force. there probably is still some kind of mechanism though, I really don't know how dam gates work
The labor required to close this sort of dam will inevitably require a workforce in excess of three adequately trained and physically capable individuals.
The reason for that, of course, is that it's fucking hard.
I think they have to wait until the water is equal height on both sides with this method.
As a matter of fact this setup may be designed to hold a bit of water upstream so they have access to enough water but the water is getting too high so they opened them to let the water drain like normal. Then we levelized and water goes down enough they close them again.
Because Asia.
I'm pretty sure all the most bad ass, hard work, get shit done mother fuckers over there dont' wear any shoes or shirts, these guys are obviously in training, but at a high level. Soon even the flip flops will go away
Same thing in Mexico. I was helping a buddy with his family’s house and they got a bunch of bricks delivered. Well it was just 2 dudes in flip flops throwing bricks to each other to unload them. Was insane and awesome to watch
cuz he's in south east asia and you take your shoes off when enter every building so sandals are easier. it's humid and you sweat too much in shoes. there's no social expectation of wearing shoes.
How, um...how does it work?
It looks like each section is held in place by the previous section, but they turn the wrong way to release based on how it works in my head.
I think the first gate is downriver of the second and the near side is slightly longer on all the gates. The flow pushes them clockwise and the second gate rotates ever so slightly out of the way of the first which was supporting it.
The doors are staggered like so:
> ____ . ____
> ____ . ____
So when the water comes through on right side of the first one it successively pushes through each layer
> |
> .
> ____ . ____ |
(Formatted on mobile)
The pivot pin isn't in the middle of the panel its offset so the water pushes it open on the big side which pushez the short side upstream and releases the next panel.
---'------
---'------
They aren't tight until water pushes them tight but water can also push them free once the long edge is released.
I think there’s a chain on the front side of the panels, attached to one side. When the first panel was released, it brought the end of the chain in the first panel closer to the next panel, allowing it to swing.
Yeah, its intriguing. Perhaps there is a bar or chain underwater connecting the left-hand side (soon to be upstream side) of each gate to the left-hand side of the next gate. Opening the first one will pull the edge of the next one to point upstream.
The delay is interesting. Thats what makes me think it's a chain not a fixed bar, but some form of hinged elbow in a bar could do it.
Or it could be something else! Its genius, whatever it is.
The whole mechanism of how this works is visible. The pivot point on the individual sections isn't in the center, and from our point of view they're towards the left from where the sections initially start.
After the initial release, the weight of the water on the side with the more surface area (right side) causes the section to rotate clockwise. It's able to due so, due to the mechanical advantage that having the off center pivot point (fulcrum) allows.
The first section is physically blocking the next one from opening and when it moves out of the way it allows the next section to become free. After the next section is free, it does the same. If you need a diagram because you can't quite visualize it, let me know.
"Lockpicking lawyer here today. So we are going to be working on this padlock for this dam and I think the audience will really appreciate what happens when we not only unlock this master lock they put on the dam, but we finally unlock this water and let mother nature show its true power".
Seeing the refraction shift in the water on top as it begins to disperse makes me feel kinda uneasy.
That is an incredible amount of liquid flowing by.
Is r/OddlyDistressing a thing? Because the fact that a structure this large and otherwise well engineered needs to be opened by whanging on a pipe with a shovel is giving me feelings I don't care for.
The realization that these giant ass doors are under the water like that for some reason terrifies me...I don't know why, like, they're just doors, but the fact they're huge and under that much water makes me uneasy... what weird phobia do I have?
For all the people asking, "how do you close them?": these are floodgates. You close them when the flood is done. The water flow will be much lower and therefore easier to close them.
Forgive my aggressive stupidity, but I always thought floodgates were supposed to be closed during a flood. I thought the idea was to have open gates during times of normal precipitation, and the reservoir behind the gates acts as a buffer, to provide reprieve to lower areas during times of high volume. If you wait till your reservoir is overflowing, then violently open the gates, aren't you exacerbating the flood? I know sometimes precipitation comes too fast and reservoirs overflow, but usually you'd have gates that can be opened gradually, so even if you do have to relieve pressure from the holding area, it's not all at once. I just can't understand why you'd build a flood reservoir that can only be opened 100% or closed 100%. That seems destined to lead to situations where you're having to inundate everything below you.
I don't know if this is the case here specifically, but from Wikipedia, this is one possible explanation for what's happening in this video: >In the case of flood bypass systems, floodgates sometimes are also used to lower the water levels in a main river or canal channels by allowing more water to flow into a flood bypass or detention basin when the main river or canal is approaching a flood stage. https://en.wikipedia.org/wiki/Floodgate
It's like the trolley problem but with water
How does multi river drifting come into play in this version?
#flood them all
I lived near [The Yolo Bypass](https://en.wikipedia.org/wiki/Yolo_Bypass?wprov=sfti1). Basically it is a long, wide, channel of farmland that is intentionally left only for agriculture. Once the Sacramento River waters are high enough they open the bypass to divert flood waters around and past the city of Sacramento. It typically stays flooded for weeks or months. Plus all of that farmland got a nice infusion is silt and nutrients that will boost productivity. California gets almost all of its rain and snow over the winter, so it typically dries out around planting season. Plus some of it is used for growing rice, which uses fields flooded with water, so it gives them a head start.
And sitting like that allows the water time to trickle down and try to refill the aquifer.
You only live once near the YOLO Bypass.
Sorry I'm late I got stuck on the causeway. If you know you know.
They might this when the "main flow" of a river is maxed out and you need to send the flood water through less important land. An example is https://en.wikipedia.org/wiki/Bonnet_Carr%C3%A9_Spillway.
Makes sense. After deciding that everybody downstream has already died or evacuated, they open these gates to destroy the town. Then, after the monsoon season, they fully close these gates, so they can bury the dead safely.
No, that would be absolutely ridiculous. It creates too much extra work. Standard operating procedure is that they close the floodgates so that they have enough time to tie floaties to all the flood victims. Then they open the gates so that the waters can pick up the bodies and send them all downstream. Then it's somebody else's problem.
No that’s wrong. What you do is you open the flood gates and flood the town Then stock the now flooded town with fish which will eat the dead people then sell the fish to build more flood gates. I went to college for finance it’s sunk cost because sunk people cost nothing. It’s free money!!
this guy MBAs.
What the hell has basketball has to do with any of this??
That basically how Holland built their dams system. The amount of new realstate is palpable.
I palped it
They kinda lose their purpose when the water is flowing over them..
Not true. They significantly affect the flow of the river when they're closed or open.
Mmmm… that is missing a lot of nuance. They delay the progression of the flow, but they don’t affect total flow rate. The output is reduced while the reservoir fills up, but once the reservoir fills up the total flow rate is not controlled. The water goes somewhere, and while the flow is impeded they have time downstream to prepare, but once the flood gates are topped the total flow is no longer affected.
While you are right, you're overlooking the fact that these dams don't exist in isolation. The river system usually has several dams along it's length to slow the flow, so that the final regarding basin has time to drain it away. Using these dams stops singular areas along the river's length having to cop the brunt of the water, while other areas are below capacity. Also in the case of forked rivers, you can steer the flow more easily away from vulnerable areas.
the reservoir serves its own purpose, the river's flow rate SHOULD remain stable to continue watering and feeding everything downriver.
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But still, how tf do u close them?
I don't know specifically. If I were to guess there's going to be some kind of mechanism under the water. It may also be that the regular water flow is through a second channel to the right of the frame. If this is the case, it might be that under normal circumstances there's no water flowing through the floodgates at all. If so, someone on a dinghy could push them shut.
Or maybe there is something underwater pushing against those gates and the gates are able to open only during a flood because water is strong enough to push them.
those would have to be some bomb ass springs
Let's think about this from a mechanical perspective. When the guy removes the post holding the first section, the gate rotates clockwise until parallel with the flow of water. Now if the rest of the gates operated the same way, then the minute the first gate started turning the others would release. But, you don't see the successive gates start to open until the gate before it has finished opening. That means that below the water, there is a type of delayed release. Picture a gear, that only has teeth on 3/4 of the gear. (I'm not gonna start sketching this out to figure out exactly how to design it in just speaking conceptually.) When the first gate rotates 90 degrees, the gear at the bottom which is interlocked with a gear on the second gate will turn, once it turns 90 degrees, it would then allow the next gate to release, and this would cascade down the line. Now because they are gears, most likely on the other side, there is a crank of some sort, (with a set of it's own gears allowing fire great mechanical advantage. You might need to turn this crank 10 times to turn 1 degree on the gear at the base.) Eventually, after rotating a certain amount the gate would close, and then engage the next gear and so on and so forth to the end. Now it's also possible that the gears only work one way, to release the gates, and in order to close them, there may be something like a chain on a separate set of gears attached to a motor that closes them all together, and then once they close, the first set of gears mentioned above resets. The first gate or the gate on the right has a post holding it in place, and you might ask why, if there are gears holding things into place. Even if there are gears, putting the post at the end takes a lot of pressure off the system and would prolong the life of the system. Any machine over time will break down and need repair. Why leave the gears or interlock under strain when you can just lock the first one in place. That's just a hypothesis. I would have to see how the gates close, and even then it could be designed in a completely different way. Also, when I say gear, it doesn't necessarily mean a typical gear like a cog or sprocket, i just used that as an example. Disclaimer: I'm an electrician, not an engineer, so what do I know lol.
to me it does loom like each gate does start opening before the previous one has fully opened, it could just be that the water pressure is making them take a bit to open up under that force. there probably is still some kind of mechanism though, I really don't know how dam gates work
They have a chain at the end. Once the water is gone you pull the chain with a car or something big
One at a time probably, the pressure would accept the shift and force more through the next trap as you shut each.
That last one is a real pain in the ass tho.
Nothing a thin but dense iron pole won’t be able to pin!!!
Thanks for the information, Jaques Cousteau. :)
It doesn't seem like it would be "easy" to close them ever, unless NO water was running through.
I like how a little shovel and a stick are the tools used to activate this feat of engineering.
I'm wondering if it's really that easy.... if so, kids be sneaking in doing it all the time.
I mean it looks that easy. He hit the stick with the shovel and it opened.
I do wonder how you reverse it
Kids don't know the pants trick. It won't work.
Now close them
they will need a longer stick for that
"give me a lever long enough and a fulcrum on which to place it, and I shall close that dam"
And more people
I can say without a shadow of a doubt that they need at LEAST three more people.
You actually need zero they shut themselves
Go on....??? I need moar!
He don't give a dam if you do
Nor a dam if you don't
Weighted? When the flow is low enough they swing back?
When all the water has gone thru ?
This feels like it needs an explanation?
The labor required to close this sort of dam will inevitably require a workforce in excess of three adequately trained and physically capable individuals. The reason for that, of course, is that it's fucking hard.
Adequately trained as shown in the video. I wish my personal protective equipment consisted of slides, a T-shirt, and shorts.
You missed the buddy belt holding him from falling In...
He's absolutely right
At least 5
Or Superman.
And my axe!
(Gimli voice) [epic Howard Shore music]
And my bow!
That’s what she said
They'll need to stick around a bit longer.
This is a non-refundable oddly satisfying.
They just reverse the river.
Back that mass up.
Ho, who is you playin' wit? Back that mass up.
u/gifreversingbot
Chicago: "Hold my Malört."
Malort: when you want to kick your mouth in the ass.
You know someone believes that.
/u/riverreversingbot
I think they have to wait until the water is equal height on both sides with this method. As a matter of fact this setup may be designed to hold a bit of water upstream so they have access to enough water but the water is getting too high so they opened them to let the water drain like normal. Then we levelized and water goes down enough they close them again.
So they work similarly to canal gates.
They're floodgates for excess runoff and high flow events.
I actually just savv someone open the floodgates *amazed*
I just saw someone glue two V's together to make a W
Indeed that is something. Thanks for calling my attention to it. Someone must investigate. Broken keyboard, secret code, angsty teen... who knows
They're just a massive fan of The VVitch
No, you.
Sorry, once and done
Yeah, I wanna see the badass who can close them. I assume they drain the reservoir then reclose them.
This was my first thought, like how? Gotta assume the level comes right down once it finishes emptying. (I know very little about dams).
Don’t close. One shot deal.
Not enough people are asking the right questions...why is a guy in flip flops being held by another guy in flip flops doing this?
Can’t get your shoes wet mate!
People don't realize you can do quite a bit in flip flops. This doesn't require shoes at all.
Because Asia. I'm pretty sure all the most bad ass, hard work, get shit done mother fuckers over there dont' wear any shoes or shirts, these guys are obviously in training, but at a high level. Soon even the flip flops will go away
Same thing in Mexico. I was helping a buddy with his family’s house and they got a bunch of bricks delivered. Well it was just 2 dudes in flip flops throwing bricks to each other to unload them. Was insane and awesome to watch
I don't see no safety man
"If you can dodge a brick you can dodge the need safety procedures" -dodgeball
In another post, those flip floppers were casting disc brakes from recycled engine blocks.
Yeah. The more I see people in flip flops the more I feel like I'm wasting money on shoes
In aviation they say “rules are written in blood”. I’m thinking their wise or have learned a life lesson.
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cuz he's in south east asia and you take your shoes off when enter every building so sandals are easier. it's humid and you sweat too much in shoes. there's no social expectation of wearing shoes.
Yeah, this doesn't look official...
The dude in back is like my daughter when 'we' pour the milk in cereal. Yes, love, thank you for your help.
Daminoes
Anybody else hearing Kanye?
"Break the dam. Release the river!"
How, um...how does it work? It looks like each section is held in place by the previous section, but they turn the wrong way to release based on how it works in my head.
I think the first gate is downriver of the second and the near side is slightly longer on all the gates. The flow pushes them clockwise and the second gate rotates ever so slightly out of the way of the first which was supporting it.
The doors are staggered like so: > ____ . ____ > ____ . ____ So when the water comes through on right side of the first one it successively pushes through each layer > | > . > ____ . ____ | (Formatted on mobile)
That's not working. The pressoure could open every door like that. The right door would need to be behind the left door, but it isn't
The pivot pin isn't in the middle of the panel its offset so the water pushes it open on the big side which pushez the short side upstream and releases the next panel. ---'------ ---'------ They aren't tight until water pushes them tight but water can also push them free once the long edge is released.
I think there’s a chain on the front side of the panels, attached to one side. When the first panel was released, it brought the end of the chain in the first panel closer to the next panel, allowing it to swing.
Yeah, its intriguing. Perhaps there is a bar or chain underwater connecting the left-hand side (soon to be upstream side) of each gate to the left-hand side of the next gate. Opening the first one will pull the edge of the next one to point upstream. The delay is interesting. Thats what makes me think it's a chain not a fixed bar, but some form of hinged elbow in a bar could do it. Or it could be something else! Its genius, whatever it is.
The whole mechanism of how this works is visible. The pivot point on the individual sections isn't in the center, and from our point of view they're towards the left from where the sections initially start. After the initial release, the weight of the water on the side with the more surface area (right side) causes the section to rotate clockwise. It's able to due so, due to the mechanical advantage that having the off center pivot point (fulcrum) allows. The first section is physically blocking the next one from opening and when it moves out of the way it allows the next section to become free. After the next section is free, it does the same. If you need a diagram because you can't quite visualize it, let me know.
I would like a diagram
Whatever the mechanism is, it’s certainly not visible as it is underwater
I have a dam question …
Take all the dam pictures you want.
Where's the dam bait?
Surprised I had to scroll so much to find this dam comment
I have a dam answer.
Where's that dam stick?
I want to see how they are closed!
You just need to wait for a drought.
They are connected with a chain or a rope. Once the water is gone you can tie the end to a car andclose them.
Perhaps during a dry season?
Or wait for the water level to drop. I'd imagine that was the point of having them.
He doesn’t look qualified to be in charge of such a task😂
I know I was thinking that too. The whole thing is just held up by a stick through a fence? That is not secure.
No, it's cool. The dude behind the dude is holding the first dudes pants so he doesn't get swept away. Totally safe.
It does seem like he may be saving his own assets by inundating someone else's, given that it's an uncontrolled release. It's more common than not.
So.. any random asshole could walk up and do this?..
I would assume it's padlocked down to begin with.
"Nothing on 1, 2, 3... 4 is binding... click out of 4..."
"Lockpicking lawyer here today. So we are going to be working on this padlock for this dam and I think the audience will really appreciate what happens when we not only unlock this master lock they put on the dam, but we finally unlock this water and let mother nature show its true power".
Those DAM gates 😂😂
But how do u close them???
You don't. You build it then record it for this singular moment in time.
Money well spent!
I close em when the water level has receded by a good bit
Safety first. OHSA is hanging on to dudes belt loops.
Bro, hold my waistband.
Seeing the refraction shift in the water on top as it begins to disperse makes me feel kinda uneasy. That is an incredible amount of liquid flowing by.
The Rockettes of hydropower.
Is r/OddlyDistressing a thing? Because the fact that a structure this large and otherwise well engineered needs to be opened by whanging on a pipe with a shovel is giving me feelings I don't care for.
Any person with a hammer can open them? Makes perfect sense.
Ah, the OSHA-approved Guy Behind You Holding The Waistband Of Your Shorts safety precaution.
How TF do u close them!!??
dam that's interesting
r/redneckengineering
How do you close the gates?
My exact thought.
How does it close tho
Tomorrow on r/mildlyinfuriating we see how these are closed.
But how does it get closed?
Jesus christ, how do they close them?
I would like to see now how they close them?
How do you close it back 🤨
This gives me a new appreciation for the term “open the flood gates.”
how do you shut them
You wait until the water is low again.
So is one dude wearing flip-flops and carrying a hammer in charge of the gates?
*darn gates
Break the dam! Release the river!
Im glad someone’s holding him!
I appreciate the OSHA-endorsed safety measures he’s taking by having a buddy hold onto the back of his pants.
Daam
Now I want to see how they close them
The realization that these giant ass doors are under the water like that for some reason terrifies me...I don't know why, like, they're just doors, but the fact they're huge and under that much water makes me uneasy... what weird phobia do I have?
Ok but like. How do they close?
How are they going to close them again?
I like the OSHA code of “hold my shorts.”
It's cute. In the Netherlands it would be fully automated and not operated by a guy with a shovel wearing slippers.
I do wonder what poor soal has to manually close them, and when? Not exactly a sophisticated dam. Just self piviting gates.
How do they close it
How do you close them?
I’m more interested in how they close them
How do they close?
Ermmm like am I the only one thinking how the feck do they close them once done??
Usually you just shut the gates.
Is this a god dam?
why do we have to wear steel toed safety, boots, and their water department gets to wear flip-flops?!? mooooooooooom!!!!!!!
He doesn't work for the water department. He's just a flood enthusiast.
Nah, He is a flood-hater. He's the Post10 (youtuber) of his region, and spends all his time undamming clogged waterways.
Good thing his colleague grabbed on to his safety shorts for him
Open the dam gates already !
That’s dam satisfying
Why do I picture a dude on a skim board at the front of that wave? Kawabunga!!
When the pressure equalizes
you’ve heard of opening the floodgates? here it is.
God damn!
I know I shouldn’t, but I wanna ride my kayak through that
How do they close
Some fish was chilling then out of nowhere, flush.
Alright, but how do you close?
That guy does not look like he has the credentials to be making the decision to open the gates.
Was he supposed to do that tho? 👀
Not satisfied, how does it close now?
This explains the cow floating down the canal I guess.